package com.yilin.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.yilin.reggie.common.BaseContext;
import com.yilin.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 登录过滤器，检查用户是否登录
 */
//                         过滤器名字           拦截什么内容
@WebFilter(filterName = "LoginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        log.info("拦截请求：{}", request.getRequestURI());

        //1.获取请求的URI
        String requestURI = request.getRequestURI();
        //2.本次请求是否处理
        //不需要处理的请求
        String[] urls= new String[]{
                "/employee/login",   //登录的请求
                "/employee/login",   //退出的请求
                "/backend/**",       //静态资源
                "/front/**",
                "/common/**",
                "/user/sendMsg",     //移动端发送短信
                "/user/login"        //移动端登录
        };
        boolean check = check(urls, requestURI);
        //3.true为不需要处理，放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //4-1.判断登录状态，登录则放行
        if(request.getSession().getAttribute("employee")!=null){

            //在线程中存入Id
            Long empId =(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            log.info("已登录");
            filterChain.doFilter(request, response);
            return;
        }
        //4-2.判断登录状态，登录则放行
        if(request.getSession().getAttribute("user")!=null){

            //在线程中存入Id
            Long userId =(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }
        //5.如果未登录，返回结果，通过输出流方式向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        log.info("未登录");
        return;
    }

    /**
     * 路径匹配，检查请求是否放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check (String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
